Validator Tax ID Number and ID Number Germany
Validate German tax number (10-11 digits, format state) and identification number (11 digits, MOD-11 checksum). Automatic type detection.
Enter the number to validate
Reference Table
| Type | Length | Checksum | Assigned by | Do you want to change? |
|---|---|---|---|---|
| Steuernummer | 10-11 cifre | No standard checksum | Local Finance Office | Change state |
| IdNr (Identifikationsnummer) | 11 cifre | MOD-11 (variante Luhn) | Bundeszentralamt fur Steuern | Permanent |
| USt-IdNr | DE + 9 cifre | MOD-11 | Bundeszentralamt fur Steuern | Rarely |
Come utilizzare Validatore Steuernummer e IdNr Germania
Attach your tax ID number or ID card
Validator accepts both formats. The tax ID has 10-11 digits with optional separators (/ or space). The ID number exactly has 11 digits.
Automatic Result
The system automatically detects the type (tax ID or ID number) and applies specific validation. For the ID number, a MOD-11 checksum is performed.
Interpret the result
View: numeric type, validation status, detailed message and contextual information about the number.
Suggerimenti
- ID Number is required for many uses: ELSTER, Child Allowance, BAFOG, communication with tax authorities.
- Tax number in the ELSTER format of 13 digits adds the Federal State code (first two digits) to the local tax number. This calculator only validates the local format.
- Generate Test IDNR using format: first digit 1-9, no repetition in digits 2-10, valid MOD-11 checksum.
- Tax ID number of a capital company (GmbH) differs from personal tax ID numbers of shareholders.
Domande frequenti
What is the difference between Steuer-Number and ID Number?
Tax ID number (10-11 digits) is assigned by the local Finanzamt and changes if changing Federal States. The Identification Number (11 digits) is assigned at birth by the Federal Central Office and never changes.
How is the tax number structured?
Depends on the state. Bayern: FF/BBB/UUUUP. North Rhine-Westphalia: FFF/BBBB/UUUUP. The format varies in 16 different regional schemes. The first 2-3 digits identify the Finanzamt.
How does the MOD-11 checksum of the ID Number work?
The algorithm MOD-11 processes the first 10 digits with a series of multiplications and additions modulo 11. The check digit (11th) is compared to the result. If they match, the ID number is valid.
Where is my tax ID number?
Tax Return Notice (tax assessment notice), on communications from the tax office, on sales tax return notification. The ID number is notified by mail from the Federal Central Office.